Patents by Inventor Tomoki Sugawa

Tomoki Sugawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Optical functioning glass and fiber amplifier
    Patent number: 5253322
    Abstract: The present invention relates to an optical functioning glass containing Nd.sup.+3 as an active ion which amplifies an input light, and at least one other optical active ion different from Nd.sup.+3 which absorbs light at and near 1 .mu.m. The present invention also relates to an optical functioning glass containing Nd.sup.+3 as an active ion which amplifies the input light, and at least one other optical active ion different from Nd.sup.+3 functioning as a promoter. An efficiency of the stimulated emission of Nd.sup.3+ caused by signal light propagated through the optical functioning glass is enhanced and a gain of the light amplification at 1.3 .mu.m is increased.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: October 12, 1993
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Masashi Onishi, Yoshiki Chigusa, Koji Nakazato, Minoru Watanabe, Yoshiaki Miyajima, Tomoki Sugawa